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Code Issues 1 Releases Wiki Activity

Address #640.

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Allow for a zero length match at the end of a string when using the
to or thru combinators.
This commit is contained in:
Calvin Rose 2021-02-19 16:10:03 -06:00
parent 92928d5c4f
commit 742469a8bc
2 changed files with 10 additions and 2 deletions
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4
src/core/peg.c
View File

@ -286,7 +286,7 @@ tail:
const uint8_t *next_text; const uint8_t *next_text;
CapState cs = cap_save(s); CapState cs = cap_save(s);
down1(s); down1(s);
while (text < s->text_end) { while (text <= s->text_end) {
CapState cs2 = cap_save(s); CapState cs2 = cap_save(s);
next_text = peg_rule(s, rule_a, text); next_text = peg_rule(s, rule_a, text);
if (next_text) { if (next_text) {
@ -296,7 +296,7 @@ tail:
text++; text++;
} }
up1(s); up1(s);
if (text >= s->text_end) { if (text > s->text_end) {
cap_load(s, cs); cap_load(s, cs);
return NULL; return NULL;
} }

8
test/suite0003.janet
View File

@ -473,4 +473,12 @@
(check-deep '(* (int 2) -1) "123" nil) (check-deep '(* (int 2) -1) "123" nil)
# to/thru bug
(check-deep '(to -1) "aaaa" @[])
(check-deep '(thru -1) "aaaa" @[])
(check-deep ''(to -1) "aaaa" @["aaaa"])
(check-deep ''(thru -1) "aaaa" @["aaaa"])
(check-deep '(to "b") "aaaa" nil)
(check-deep '(thru "b") "aaaa" nil)
(end-suite) (end-suite)